var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (g && (g = 0, op[0] && (_ = 0)), _) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
var FetchStream = /** @class */ (function () {
    function FetchStream(options) {
        this.timer = 0;
        this.data_segment = '';
        this.url = options.url;
        this.requestInit = options.requestInit;
        this.onmessage = options.onmessage;
        this.ondone = options.ondone;
        this.onerror = options.onerror;
        this.controller = new AbortController();
        this.createFetchRequest();
    }
    FetchStream.prototype.createFetchRequest = function () {
        var _this = this;
        this.timeout(); // 开启超时计时器
        fetch(this.url, __assign({ method: 'POST', signal: this.controller.signal }, this.requestInit)).then(function (response) {
            clearTimeout(_this.timer); // 拿到结果，清除 timeout 计时器
            if (response.status === 200) {
                return response.body;
            }
            else {
                // fetch() 返回的 Promise 不会被标记为 reject，即使响应的 HTTP 状态码是 404 或 500
                return Promise.reject(response);
            }
        }).then(function (readableStream) { return __awaiter(_this, void 0, void 0, function () {
            var reader, index, _a, value, done, dataText, data;
            var _b;
            return __generator(this, function (_c) {
                switch (_c.label) {
                    case 0:
                        reader = readableStream.getReader();
                        index = 0;
                        _c.label = 1;
                    case 1:
                        if (!true) return [3 /*break*/, 3];
                        return [4 /*yield*/, reader.read()];
                    case 2:
                        _a = _c.sent(), value = _a.value, done = _a.done;
                        if (done) { // 响应流处理完成
                            // 5. 流已关闭，执行外部结束逻辑
                            (_b = this.ondone) === null || _b === void 0 ? void 0 : _b.call(this);
                            return [3 /*break*/, 3];
                        }
                        else {
                            dataText = (this.data_segment || '') + (new TextDecoder().decode(value));
                            data = dataText.split('\n\n').filter(Boolean);
                            this.data_segment = this.onmessage(data, index++);
                        }
                        return [3 /*break*/, 1];
                    case 3: return [2 /*return*/];
                }
            });
        }); }).catch(function (response) {
            var _a;
            // ... error 处理
            (_a = _this.onerror) === null || _a === void 0 ? void 0 : _a.call(_this, response);
        });
    };
    FetchStream.prototype.abort = function () {
        if (this.controller)
            this.controller.abort();
    };
    FetchStream.prototype.timeout = function (time) {
        var _this = this;
        if (time === void 0) { time = 60000; }
        this.timer = setTimeout(function () {
            var _a;
            _this.abort();
            (_a = _this.ontimeout) === null || _a === void 0 ? void 0 : _a.call(_this); // 外部若传入了监听超时回调，类似 onmessage
        }, time);
    };
    return FetchStream;
}());

export default FetchStream;
